Line M passes through the points (–5, 9) and (–1, 9).

Which is true of line M?

Line M is a vertical line with an undefined slope.
Line M is a vertical line with a slope of zero.
Line M is a horizontal line with an undefined slope.
Line M is a horizontal line with a slope of zero.

Joe owns a fast-food restaurant and wants to know the average time it takes for customers to receive their orders. his restaurant serves about 500 customers a day. he timed 5 orders, and the order times he collected, given in minutes, are shown below. can the approximate order fulfillment time for all of the restaurant's customers be calculated from the given data? if so, calculate it. non-integer answers should be rounded to the nearest tenth. if no assumption can be made, type "0" in the box. the approximate order fulfillment time for all of the restaurant's customers is minutes.